A quick check shows 2 of 3 Fusion engine choices are turbocharged. Jackrabbit driving and/or just a lot of stop/go driving could account for the large difference in MPG's folks are getting.
The NA engine in my GS gives me ~6MPG difference depending on whether I'm on the highway or secondary roads; I don't do enough stop/go driving to know for sure but I'd wager the MPG difference would be even higher. (Driving style is consistent.)
In my dearly departed STi I could get 7-8 MPG easily, or 24+ MPG easily, the difference all being in how I applied my right foot. That's a bit different than an economy-minded Fusion but I think it's still relevant.
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